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CMV12000

Functional Description

Datasheet

• PUBLIC

DS000603

• v6-00 • 2023-Sep-22

│ 38

7.4.2

Frame Timing

The frame rate of the CMV12000 is defined by two main factors.

●

Exposure time

●

Read-out time

FOT (Frame Overhead Time) will only have an influence when very few rows are read out.

For ease of use we will assume that the exposure time is equal to or shorter than the read-out time. By

assuming the frame rate is completely defined by the read-out time (because the exposure time

happens in parallel with the read-out time). The read-out time (and thus the frame rate) is defined by:

●

Clock speed: 600 MHz maximum

●

ADC mode: 8, 10 or 12-bit

●

Number of lines read-out (windowing, subsampling or binning)

●

Number of LVDS data outputs used: 64 maximum

This means that if any of the parameters above are changed, it will have an impact on the frame rate

of the sensor.

All timings can be expressed in line times:

Equation 3:

�� = (��85 + 1) ∗ ��_��_�� ∗ #��

The total read-out time is composed of the FOT and the image readout time. The image readout time

is dependent of the total number of read out lines (#readout lines), sides used and the line time.

Equation 4:

�� = (��82[15: 8] + 2) ∗ ��

Equation 5:

�� =

#��

∗ ��

The number of lines read out will depend on the mode:

●

Normal mode: #readout lines = Number_lines_tot

●

X&Y-Subsampling: #readout lines = Number_lines_tot/2

●

Binning: #readout lines = Number_lines_tot/4

Number_lines_tot is the value of register 1.

When running at 600 MHz in 10-bit mode with 64 output channels, register 82[15:8] is 12 and register

85 is 128. This will result in a line time of 2.15 µs, FOT of 30.1 µs and an image read-out time of

3.3024 ms for the full pixel array.

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